diff --git a/Gemfile b/Gemfile
index 90124c8d9..7360d6992 100644
--- a/Gemfile
+++ b/Gemfile
@@ -74,7 +74,7 @@ group :development, :test do
   gem 'rubocop-rails'
   gem 'rubocop-rspec'
   gem 'spring', '~>2.1.1' # remove constraint once on or past rails 5.2
-  gem 'sprockets', '~>3.7'
+  gem 'sprockets', '~>4.2'
   gem 'ten_years_rails'
 end
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 0bdc97b35..625bc80c4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -110,7 +110,7 @@ GEM
       activesupport
     coderay (1.1.3)
     colorize (0.8.1)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.2)
     congestion (0.1.0)
       connection_pool (>= 2.0)
       redis (>= 3.1)
@@ -468,9 +468,9 @@ GEM
     spring (2.1.1)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (3.7.2)
+    sprockets (4.2.0)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
+      rack (>= 2.2.4, < 4)
     sprockets-rails (3.4.2)
       actionpack (>= 5.2)
       activesupport (>= 5.2)
@@ -581,7 +581,7 @@ DEPENDENCIES
   sidekiq-unique-jobs
   spring (~> 2.1.1)
   spring-commands-rspec
-  sprockets (~> 3.7)
+  sprockets (~> 4.2)
   standby
   stringex (~> 2.8)
   strong_migrations